Jin AirLJ100% on time
Flights LJ656 16:05 daily
live
Direct flights from Ulsan (USN) to Seoul (GMP): 14 nonstop departures observed each week across 2 airlines. 96% of the last 24 operated flights arrived within 15 minutes of schedule. The median arrival is 9 minutes early. No cancellations were recorded across the 24 tracked flights. The nonstop covers 316 km, an estimated 54 minutes in the air. Measured by Pro Flight Search from live flight boards at Ulsan and Seoul. Updated 10 September 2026 at 19:09 UTC.
USN
Ulsan
tracking
GMP
Seoul
smooth · +6
316 km · ~0h 54m est.
Runs reliable · 2 airlines · 14x weekly · nonstop
96% on time
of the last 24 operated USN → GMP flights arrived within 15 minutes
Median arrival delay is −9 min. 0 of 24 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival−9 minacross the last 24 operated legs
Flight time~0h 54mestimated from route distance
Weekly departures14x2 direct airlines on the leg
Cancelled0.0%recent route rate · 0 of 24
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Jin Air대한항공
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsnext sweep in 120s
How the Ulsan to Seoul route actually runs
Pro Flight Search records official board updates for nonstop USN to GMP flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Ulsan (USN) to Seoul (GMP) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/USN-GMP
USN to GMP questions
Is USN–GMP running on time right now?
Smooth skies ahead. The arrival side at GMP is the weaker end, route health score 90/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from USN to GMP?
Great-circle distance is 316 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 52–57 min gate-to-gate on this route.
How often does USN–GMP fly?
2 carriers operate this route, around 21 flights a week between them. Compare carrier days and times in the airline list above.
What does the route health score measure?
A blend of departure-side delay at USN and arrival-side delay at GMP, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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